Computer Simulation of Marine Traffic Systems

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A computer model was constructed that allowed two vessels involved in
a possible collision situation to take collision avoidance action
following the "International Regulations for Preventing Collisions at
Sea". The mariners’ actions were modelled by the concepts of the domain
and the RDRR (Range to Domain/Range-rate). The domain was used to
determine if a vessel was threatening and the RDRR to determine the
time at which a vessel should give-way to a threatening target. Each
vessel in the simulation had four domains corresponding to the type of
encounter in which the vessel was involved. Values for the time at
which a vessel manoeuvres and the domain radii were determined from an
analysis of high quality cine films of the radar at H.M. Coastguard at
St. Margaret's Bay, Dover. Information was also taken from simulator
exercises set up on the Polytechnic radar simulator. The two ship
encounter was then developed to become the multi-ship encounter and
eventually was able to model over 400 vessels over a two day period
through a computer representation of the Dover Strait.
A further development included a computer graphical representation of
a radar simulator running in real-time, and which allowed a mariner to
navigate one of the vessels using computer control.
A validation of the computer model was undertaken by comparing the
simulated results with those observed from the cine films. Following
the validation several examples of the computer model being used as a
decision support system were included.

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All items in PEARL are protected by copyright law.
Author manuscripts deposited to comply with open access mandates are made available in accordance with
publisher policies. Please cite only the published version using the details provided on the item record or document.
In the absence of an open licence (e.g. Creative Commons), permissions for further reuse of content should be
sought from the publisher or author.